5c58d27aac
Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Co-authored-by: Stefan Karlsson <stefan.karlsson@oracle.com> Co-authored-by: Mikael Gerdin <mikael.gerdin@oracle.com> Co-authored-by: Tom Rodriguez <tom.rodriguez@oracle.com> Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
92 lines
3.0 KiB
C++
92 lines
3.0 KiB
C++
/*
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* Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_CI_CIBASEOBJECT_HPP
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#define SHARE_VM_CI_CIBASEOBJECT_HPP
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#include "ci/ciClassList.hpp"
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#include "memory/allocation.hpp"
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#include "runtime/handles.hpp"
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#include "runtime/jniHandles.hpp"
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// ciBaseObject
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//
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// This class represents an oop in the HotSpot virtual machine.
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// Its subclasses are structured in a hierarchy which mirrors
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// an aggregate of the VM's oop and klass hierarchies (see
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// oopHierarchy.hpp). Each instance of ciBaseObject holds a handle
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// to a corresponding oop on the VM side and provides routines
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// for accessing the information in its oop. By using the ciBaseObject
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// hierarchy for accessing oops in the VM, the compiler ensures
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// that it is safe with respect to garbage collection; that is,
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// GC and compilation can proceed independently without
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// interference.
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//
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// Within the VM, the oop and klass hierarchies are separate.
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// The compiler interface does not preserve this separation --
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// the distinction between `Klass*' and `Klass' are not
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// reflected in the interface and instead the Klass hierarchy
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// is directly modeled as the subclasses of ciKlass.
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class ciBaseObject : public ResourceObj {
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CI_PACKAGE_ACCESS
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friend class ciEnv;
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protected:
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uint _ident;
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enum { FLAG_BITS = 1 };
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enum {
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SCAVENGABLE_FLAG = 1
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};
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protected:
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ciBaseObject(): _ident(0) {}
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virtual const char* type_string() { return "ciBaseObject"; }
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void set_ident(uint id);
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public:
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// A number unique to this object.
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uint ident();
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// What kind of ciBaseObject is this?
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virtual bool is_symbol() const { return false; }
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virtual bool is_object() const { return false; }
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virtual bool is_metadata() const { return false; }
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ciSymbol* as_symbol() {
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assert(is_symbol(), "must be");
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return (ciSymbol*)this;
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}
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ciObject* as_object() {
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assert(is_object(), "must be");
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return (ciObject*)this;
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}
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ciMetadata* as_metadata() {
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assert(is_metadata(), "must be");
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return (ciMetadata*)this;
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}
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};
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#endif // SHARE_VM_CI_CIBASEOBJECT_HPP
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